pub fn emit_swiglu(spec: &SwiGluSpec, knobs: &CudaKnobs) -> StringExpand description
Emit a self-contained CUDA program for a recognized SwiGLU map — y[i] = silu(gate[i]) * up[i], one thread
per element, self-contained host (deterministic fills + Σ Y checksum). Chip-stamped like the fused-row.